:root {
            --primary-color: #1a5fb4;
            --secondary-color: #e6b422;
            --dark-color: #0d1b2a;
            --light-color: #f8f9fa;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        body {
            font-family: 'Helvetica Neue', Arial, 'Microsoft YaHei', sans-serif;
            color: #333;
            line-height: 1.8;
            overflow-x: hidden;
        }
        .navbar-brand {
            font-weight: 700;
            font-size: 1.5rem;
            color: var(--primary-color) !important;
        }
        .navbar-nav .nav-link {
            color: var(--dark-color) !important;
            font-weight: 500;
            padding: 0.5rem 1.2rem;
            transition: color 0.3s, background-color 0.3s;
            border-radius: 4px;
        }
        .navbar-nav .nav-link:hover,
        .navbar-nav .nav-link.active {
            color: white !important;
            background-color: var(--primary-color);
        }
        .hero-banner {
            background: linear-gradient(rgba(13, 27, 42, 0.8), rgba(13, 27, 42, 0.9)), url('https://images.unsplash.com/photo-1556056504-5c7696c4c28d?ixlib=rb-4.0.3&auto=format&fit=crop&w=1600&q=80') center/cover no-repeat;
            color: white;
            padding: 120px 0;
            text-align: center;
        }
        .hero-banner h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            text-shadow: 2px 2px 8px rgba(0,0,0,0.5);
        }
        @media (max-width: 768px) {
            .hero-banner h1 {
                font-size: 2.5rem;
            }
        }
        .card {
            border: none;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.3s, box-shadow 0.3s;
            height: 100%;
        }
        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
        }
        .card-img-top {
            height: 200px;
            object-fit: cover;
        }
        .card-title {
            color: var(--primary-color);
            font-weight: 700;
        }
        .btn-primary {
            background-color: var(--primary-color);
            border: none;
            padding: 12px 28px;
            font-weight: 600;
            border-radius: 30px;
            transition: background-color 0.3s, transform 0.2s;
        }
        .btn-primary:hover {
            background-color: #0f4a8f;
            transform: scale(1.05);
        }
        .btn-outline-light {
            border-radius: 30px;
            padding: 12px 28px;
            font-weight: 600;
            transition: all 0.3s;
        }
        .btn-outline-light:hover {
            background-color: white;
            color: var(--primary-color);
        }
        .section-title {
            text-align: center;
            margin-bottom: 3rem;
            position: relative;
            padding-bottom: 15px;
        }
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background-color: var(--secondary-color);
            border-radius: 2px;
        }
        .table-custom {
            border-collapse: separate;
            border-spacing: 0;
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .table-custom thead th {
            background-color: var(--primary-color);
            color: white;
            border: none;
            padding: 1rem;
        }
        .table-custom tbody tr:nth-child(even) {
            background-color: #f8f9fa;
        }
        .table-custom tbody tr:hover {
            background-color: #e9ecef;
        }
        .friendlink {
            background-color: #f1f7ff;
            padding: 4rem 0;
        }
        .flink {
            display: inline-block;
            padding: 12px 24px;
            margin: 8px;
            background-color: white;
            border-radius: 8px;
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 600;
            box-shadow: var(--shadow);
            transition: all 0.3s;
        }
        .flink:hover {
            background-color: var(--primary-color);
            color: white;
            transform: translateY(-3px);
        }
        footer {
            background-color: var(--dark-color);
            color: white;
            padding: 3rem 0 1.5rem;
        }
        footer a {
            color: #ccc;
            text-decoration: none;
            transition: color 0.3s;
        }
        footer a:hover {
            color: var(--secondary-color);
        }
        @media (max-width: 768px) {
            .display-4 {
                font-size: 2.5rem;
            }
            .card-img-top {
                height: 150px;
            }
        }
        section {
            padding: 5rem 0;
        }
        section:nth-child(even) {
            background-color: #f9f9f9;
        }
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .animate-fadeInUp {
            animation: fadeInUp 0.8s ease-out;
        }